Q. Bleeding due to a cut can be stopped by applying ferric chloride solution in the laboratory. This is due to
A) Coagulation of negatively charged blood particles by ${Fe}^{3 +}$ ions.
B) Coagulation of positively charged blood particles by ${Cl}^{-}$ions.
C) Reaction taking place between ferric ions and the haemoglobin forming a complex
D) Common element, iron, in both ${FeCl}_{3}$ amd haemoglobin
Explanation
(a)
Bleeding due to cut can be stopped by applying $Fe{Cl}_{3}$or alum solution. This is due to coagulation of negatively charged colloidal blood particles (albuminoid substance) by positively charged ${Fe}^{3 +}$ ions. These substances are used as styptic (which check the flow of blood).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.